以机械合金化新工艺制造弥散强化铝镁合金

把纯铝粉和铝-镁合金粉与炭黑或有机试剂（如甲醇、硬脂酸等）在高能球磨机内研磨,获得机械合金化粉末。将这种粉末冷等静压密实,然后在820°K下挤压,挤压比为26:1,最后制得合金棒材。这种棒材的机械性能检验结果表明,用机械合金化新工艺制造的弥散强化铝-镁合金,机械性能优良。例如54号合金,其机械性能是,σ_b519—529MN/m2,σ_0.2510—519MN/m2,δ4—6%,Ψ9-14%。实验结果还表明,采用这种新工艺制造的铝-镁合金,与铸造铝-镁合金相比,它的机械性能有很大的改善和提高。特别是在573°K温度下经100小时退火后,其极限抗张强度下降得很小或完全不下降。因此这类合金作为一种结构材料使用将会有很大的潜力。

DISPERSION-STRENGTHENING Al-Mg ALLOYS MADE BY NEW TECHNOLOGY OF MECHANICAL ALLOYING

Mechanical alloying powders were prepared by blending the mixture of pure Al powder and Al-Mg alloy powder with carbon or organic agents （e.g. methanol, stearic acid,etc.）in a high energy ball milling machine. The powder Mixture was compacted into bars by cold isostatical pressing equipment. The compact bars were extruded at 820°K with a reduction ratio of 26:1. The mechanical properties of the dispersion-strengthening Al-Mg alloys made by above process technique were super: as an example of No. 54 alloy, σ_b 519-529 MN/m2, σ_0.2 510-519 MN/m2, δ4-6%, ψ9-14%. The experimental results have also indicated that these alloys can be compared with those of conventional casting Al-Mg alloys. The mechanical properties of studied Al-Mg alloys has been remarkably improved. After annealing at 573°k for 100 hours, there was a little decrease even no decrease in the ultimate tensile strength of the alloy. Therefore, these alloys have a potential to be used as a kind of structural materials.